YASKAWA V1000 Technical Manual page 286

6.9 Troubleshooting without Fault Display
n PID output fault
Cause
No PID feedback input.
The level of detection and the target value do not
correspond with each other.
Reverse drive output frequency and speed detection.
When output frequency rises, the sensor detects a
speed decrease.
n Insufficient Motor Torque
Cause
Auto-Tuning has not yet been performed (required
for OLV Control).
The control mode was changed after performing
Auto-Tuning.
Only Line-to-Line Resistance Auto-Tuning was
performed.
n Motor Rotates After the Drive Output is Shut Off
Cause
Low DC Injection Braking and the drive cannot
decelerate properly.
n ov or Speed Loss Occurs When Starting into a Rotating Load
Cause
The load is already rotating when the drive is trying
to start it.
n Output Frequency is not as High as Frequency Reference
Cause
Frequency reference is set within the range of the
Jump Frequency.
Upper limit for the frequency reference has been
exceeded.
Large load triggered Stall Prevention function during
acceleration.
n Buzzing Sound from Motor at 2 kHz
Cause
Exceeded 110% of the rated output current of the
drive while operating at low speeds.
286
• Check the multi-function analog input terminal settings.
• Set multi-function analog input terminal A1 or A2 for PID feedback (H3-02 or H3-10 =
"B").
• A signal input to the terminal selection for PID feedback is necessary.
• Check the connection of the feedback signal.
• Check the various PID-related parameter settings.
• No PID feedback input to the terminal causes the value detected to be 0, causing a PID fault
and the drive to operate at max frequency.
• PID control keeps the difference between target and detection values at 0. Set the input level
for the values relative to one another.
• Use analog input gains H3-03/11 to adjust PID target and feedback signal scaling.
Set PID output for reverse characteristics (b5-09 = "1").
Perform Auto-Tuning.
Perform Auto-Tuning again.
Perform Rotational Auto-Tuning.
• Adjust the DC Injection braking settings.
• Increase the value of b2-02 (DC Injection Braking Current).
• Increase the b2-04 (DC Injection Braking Time at Stop).
• Stop the motor using DC Injection braking. Restart the motor.
• Increase the value of b2-03 (DC Injection Braking Time at start).
• Enable Speed Search at start (b3-01 = "1").
• Set a multi-function input terminal for external Speed Search command (H1-oo="61" or
"62" during restart).
• Adjust the parameters used for the Jump Frequency function (d3-01, d3-02, d3-03).
• Enabling the Jump Frequency prevents the drive from outputting the frequencies specified
in the Jump Frequency range.
• Set the maximum output frequency and the upper limit for the frequency reference to more
appropriate values (E1-04, d2-01).
• The following calculation yields the upper value for the output frequency = E1-04 x d2-01 /
100
• Reduce the load.
• Adjust the Stall Prevention level during acceleration (L3-02).
• If the output current rises too high at low speeds, the carrier frequency automatically reduces
and causes a whining or buzzing sound.
• If the sound is coming from the motor, disable carrier frequency derating (L8-38 = "0").
• Disabling the automatic carrier frequency derating increases the chances of an overload fault
(oL2). Switch to a larger capacity motor if oL2 faults occur too frequently.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions
Possible Solutions